I find they way https://bugzilla.mozilla.org does much better, and they have a bot that automatically send the report to correct classification based on the written bug report details.
If KDE can’t do something like that, I guess adding classification in KDE wiki would help? like I want to report something related to the panel but don’t know where to report exactly.
https://bugzilla.mozilla.org/ is for a much smaller set of software. Whereas the range of what you can open a bug report about in KDE is pretty vast! So there just inherently have to be more options there, which makes it a harder problem to solve.